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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Using Dynaco A420 opt with ST70 kit posted by DAK on November 25, 2012 at 21:36:12:
Unfortunately, the terminology can obscure the reality with "cathode-biased" and "fixed bias". The K&K Audio ST-70 Upgrade output stage actually falls under the "cathode-biased" label, since the current sinks are between the output tube cathodes and ground and the output tube grids are returned to ground through a grid leak resistor. In "fixed-bias" output stages, the cathodes of the output tubes are connected directly to ground and the output tube grids are returned through a grod leak resistor to a negative voltage, which is typically variable, so that the bias current can be adjusted for different output tubes. So "fixed-bias" is adjustable and "cathode-bias" is fixed. Funny, huh?
Kevin Carter
K&K Audio
www.kandkaudio.com
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Follow Ups
- RE: Using Dynaco A420 opt with ST70 kit - KevinC 04:10:53 11/26/12 (4)
- RE: Using Dynaco A420 opt with ST70 kit - DAK 15:03:32 11/26/12 (3)
- RE: Using Dynaco A420 opt with ST70 kit - KevinC 16:03:16 11/26/12 (2)
- RE: Using Dynaco A420 opt with ST70 kit - DAK 10:41:50 11/29/12 (1)
- RE: Using Dynaco A420 opt with ST70 kit - KevinC 12:06:14 11/29/12 (0)
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